/*  $OpenBSD: tftp.h,v 1.8 2006/07/26 16:43:30 deraadt Exp $    */
/*  $NetBSD: tftp.h,v 1.3 1994/10/26 00:56:48 cgd Exp $ */

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *  @(#)tftp.h  5.4 (Berkeley) 4/3/91
 */

#ifndef _TFTP_H_
#define _TFTP_H_

/*
 * Trivial File Transfer Protocol (IEN-133)
 */
#define SEGSIZE     512     /* data segment size */
#define SEGSIZE_MIN 8       /* minimal data segment size */
#define SEGSIZE_MAX 65464       /* maximal data segment size */

/*
 * Packet types.
 */
#define RRQ 01          /* read request */
#define WRQ 02          /* write request */
#define DATA    03          /* data packet */
#define ACK 04          /* acknowledgement */
#define ERROR   05          /* error code */
#define OACK    06          /* option acknowledgement */

struct  tftphdr {
    u_int16_t th_opcode;        /* packet type */
    union {
        u_int16_t tu_block; /* block # */
        u_int16_t tu_code;  /* error code */
        char    tu_stuff[1];    /* request packet stuff */
    } th_u;
    char    th_data[1];     /* data or error string */
};

#define th_block    th_u.tu_block
#define th_code     th_u.tu_code
#define th_stuff    th_u.tu_stuff
#define th_msg      th_data

/*
 * Error codes.
 */
#define EUNDEF      0       /* not defined */
#define ENOTFOUND   1       /* file not found */
#define EACCESS     2       /* access violation */
#define ENOSPACE    3       /* disk full or allocation exceeded */
#define EBADOP      4       /* illegal TFTP operation */
#define EBADID      5       /* unknown transfer ID */
#define EEXISTS     6       /* file already exists */
#define ENOUSER     7       /* no such user */
#define EOPTNEG     8       /* option negotiation failed */

#endif /* !_TFTP_H_ */
